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以中国西南高烈度地震区某拟建连拱隧道为背景,提出隧道洞口段2种全环注浆抗震加固方案,即全环间隔注浆和全环接触注浆;并采用三维数值模拟对不同注浆形式和注浆厚度进行了研究。结果表明:连拱隧道全环注浆2种加固形式均能有效减小隧道-围岩系统的动力相互作用,从而提高隧道整体抗震性能;其中全环接触注浆效果最优,全环间隔注浆效果次之,局部注浆效果不明显;全环接触注浆厚度增大到0.5倍开挖宽度以后,注浆效果几乎不变。研究结论对公路隧道抗震设计、施工有一定参考价值。
Based on the proposed double arch tunnel in high seismicity area of southwest China, two kinds of full annular grouting aseismic reinforcement schemes are proposed, namely full ring interval grouting and full ring grouting. Three-dimensional numerical simulation Grouting form and grouting thickness were studied. The results show that the full ring grouting of double arch tunnel can effectively reduce the dynamic interaction between the tunnel and the surrounding rock system and improve the overall seismic performance of the tunnel. The whole ring contact grouting effect is the best, The grouting effect is followed by the local grouting effect is not obvious; full ring contact grouting thickness increased to 0.5 times the excavation width, the grouting effect is almost unchanged. The conclusions of the study have certain reference value for seismic design and construction of highway tunnels.